High frequency analysis of hydraulic excavators

Nowadays, the technology of excavators has been significantly improved. With the advancement of science and technology, modern excavators basically adopt the control mode of machine, electricity, and liquid. Therefore, in the process of actual operation, if the excavator fails, we usually check the matching problems of the engine, hydraulic pump and external load. In the process of excavators, most of the problems appear on the matching of external loads. If they do not get a good match in this area, the engine speed will slow down, the operating speed is slow, or even the weakness.

Below, let's take a look at the performance and exclusion method of these fault problems.

The engine speed is slowed down

If the output power of the engine is far lower than the rated power, you should check whether the fuel filter element has occurred and check whether there is an air leakage in the fuel road; whether the plunger, the fuel injection head and the oil outlet valve in the fuel pump are severely worn severe wear. Signs; whether the air filter element is unobstructed; if the turbocharger engine is engine, it should be checked whether the turbocharger is damaged; whether the engine is high; whether the oil viscosity decreases; whether the cylinder component has worn, etc. The above -mentioned fault performances directly lead to a decline in the engine power; otherwise, if the above problems do not exist, they should consider whether the flow of the flow of the hydraulic pump and the matching of the engine output power.

In the construction operation of hydraulic excavators, its operating speed and load should be inversely proportional. The pump output pressure and the product of the flow are a constant, and the output power of the pump is constant or approximate. If the pump control system fails, it cannot reach a good match between the engine and the pump, valve, and load, and eventually causes the excavator to work normally. Because modern excavators are integrated and high -tech products by machines, electricity, and liquids, they have high technical content. Therefore, when such excavators fail, they should start with the electrical system and then conduct the hydraulic system. *Check the mechanical transmission system. Here, the editor should be emphasized with you that the inspection of the hydraulic system should follow the steps of the auxiliary oil road -control oil road -main oil road -control element.

Slow operation speed

After years of use, a excavator has slowed down the operating speed. It is a common thing that is usually due to the exaggeration of mechanical wear as the operation time. Due to the wear of each component of the excavator, the power of the excavator engine and the phenomenon of leakage in the hydraulic system. Once a hydraulic system is leaked in the excavator, it will cause adverse consumption of the internal ability of the excavator, which will cause a large amount of thermal energy to quickly heat up the entire hydraulic system. When the temperature rises, the oil viscosity of the engine will decline. In response to this situation, we can start from the following aspects.

1. Check whether the circuit fuse is disconnected or short -circuit;

2. Whether the pressure is normal;

3. Whether the servo control valve and servo piston are stuck;

4. Whether the distribution device is in a failure;

5. Eliminate other possibilities,*disassemble the hydraulic pump.

The excavator is weak

The whole machine is unable to divide the several aspects. First, when the external load is large, the engine has dropped sharply. Constant power output. That is, without affecting the speed, adjust the angle of the slope to reduce the displacement. Second, the engine does not reduce the engine when the load is large, and the system speed is normal; this requires the pressure of the system. Because the pressure of the hydraulic cylinder stipulated by the hydraulic components used by the various manufacturers is also different, the pressure of each hydraulic cylinder specified by the hydraulic system is also different. Just specify standard debugging. In addition, if the pressure of the overflow valve cannot be adjusted and the overflow valve is inspected in a good state, it is necessary to check the regulating system of the hydraulic pump, and even the cylinder body of the hydraulic pump, the stream disk, the plunger and other parts.

The above parts are the problem of high frequency of hydraulic excavators during use. As the use time of excavators is gradually shifted, we need to strengthen daily maintenance work to prevent mechanical damage caused by bad homework habits. We must find problems in time and solve problems in time. Only in this way can the excavator better cooperate with us to complete each construction task to better serve your work and life.